One man's artistic vision is a small town government's legal battle.

Known as the most dangerous bridge in the world, the Hussaini Hanging Bridge is only one of many precarious rope bridges in Northern Pakistan.

The largest cave shaft in the world is home to thousands of birds and popular with BASE jumpers.

A sculpture of a giant hand reaches for the stars in the middle of the Atacama desert.

Rock-cut caves and 7,000 Buddhist sculptures carved into the nearly sheer face of a sandstone mountain.

An open-air museum in a mountain valley features works designed to blend in with—and disintegrate back into—their natural surroundings.

A theme park that suffered massive flooding during Katrina was abandoned, and now proves irresistible to trespassing explorers.

The world's second largest salt mine, said to have been discovered by Alexander the Great's horse.

Mutant vegetables, transgenic mosquitos, and atomic rodents span the walls of this one-of-a-kind museum.

Treehouse motel and treehouse-building school.

Sleep snuggled in a sphere suspended atop the forest canopy of Vancouver Island.

Dr. Farid Mattar's Monument of Peace.

An Australian lake whose pink hue defies scientific explanation.

An ancient stone fortress considered by many to be the eighth wonder of the world.

The world's second-largest excavated hole.

An 80-year-old house built out of newspapers.

The feral felines of Roosevelt Island have a small army of allies and an abandoned hospital all to themselves.

On Japan's Tashirojima Island, cats are king.

World's largest cave was only discovered in 1991, and now offers tours to the public.

This mountaintop lake bubbles and steams in a perpetual boil, thanks to its direct link to the Earth's interior.

A precariously perched golden rock defies gravity and brings pilgrims from across Myanmar.

A faithful reproduction of Al-Jazari's enormous water clock.

Northern Ireland's Brobdingnagian stepping stones.

The world's largest statue of Mao Zedong looks out over the city where he discovered Communism.